So these empirical observations then are summarized into four laws.
这些经验性的观察,被总结成四条定律。
So the lessons to be learned, after years of watching this, is that the norm is change.
因此在观察许多年后,我发现了经验,改变是一种常态。
But that's an empirical observation, that heat flows in this direction.
但是我们只是根据,经验观察。
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